SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	$ (6,429)	$ (8,411)
Other comprehensive income (loss) before reclassifications net of tax	(805)	15
Amounts reclassified from accumulated other comprehensive income net of tax	(44)	(55)
Other comprehensive income (loss), net of tax	(849)	(40)
Balance, end of period	(7,278)	(8,451)
Unrealized Foreign Currency Translation Gains (Losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(3,564)	(1,985)
Other comprehensive income (loss) before reclassifications net of tax	(54)	(453)
Amounts reclassified from accumulated other comprehensive income net of tax	0	0
Other comprehensive income (loss), net of tax	(54)	(453)
Balance, end of period	(3,618)	(2,438)
Unrealized Gains (Losses) on Fixed Maturity Securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(702)	9,602
Other comprehensive income (loss) before reclassifications net of tax	2,036	(3,754)
Amounts reclassified from accumulated other comprehensive income net of tax	(45)	(61)
Other comprehensive income (loss), net of tax	1,991	(3,815)
Balance, end of period	1,289	5,787
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(27)	(30)
Other comprehensive income (loss) before reclassifications net of tax	0	0
Amounts reclassified from accumulated other comprehensive income net of tax	1	1
Other comprehensive income (loss), net of tax	1	1
Balance, end of period	(26)	(29)
Effect of changes in discount rate assumptions
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(2,100)	(15,832)
Other comprehensive income (loss) before reclassifications net of tax	(2,794)	4,224
Amounts reclassified from accumulated other comprehensive income net of tax	0	0
Other comprehensive income (loss), net of tax	(2,794)	4,224
Balance, end of period	(4,894)	(11,608)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(36)	(166)
Other comprehensive income (loss) before reclassifications net of tax	7	(2)
Amounts reclassified from accumulated other comprehensive income net of tax	0	5
Other comprehensive income (loss), net of tax	7	3
Balance, end of period	$ (29)	$ (163)